Freshwater, Benthic
Koi (specifically Yamabuki Ogon variety)
Cyprinus rubrofuscus
Elongated, torpedo-shaped body with a metallic yellow or gold coloration known as 'Yamabuki'. It features prominent scales, a single dorsal fin, and two pairs of barbels near the mouth. This specimen exhibits a solid metallic sheen without additional patterns.
- Habitat
- Native to Central Asia but widely distributed globally i…
- Size & weight
- Typically ranges from 24 to 36 inches (60–90 cm) in leng…
- Diet
- Omnivorous and opportunistic feeder.…
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Physical characteristics
Elongated, torpedo-shaped body with a metallic yellow or gold coloration known as 'Yamabuki'. It features prominent scales, a single dorsal fin, and two pairs of barbels near the mouth. This specimen exhibits a solid metallic sheen without additional patterns.
Habitat & distribution
Native to Central Asia but widely distributed globally in ornamental ponds, gardens, and lakes. They prefer slow-moving or stagnant freshwater with soft sediment bottoms.
Behavior
Social and schooling fish that are generally docile. They are most active during the day (diurnal) and exhibit higher activity levels in warmer water. They are known for their ability to recognize frequent visitors.
Diet
Omnivorous and opportunistic feeder. Diet includes algae, aquatic insects, worms, crustaceans, and plant matter. They use their sensitive barbels to find food in the substrate.
Reproduction
External fertilizers that spawn in spring or early summer when water temperatures rise. Females scatter thousands of adhesive eggs over aquatic vegetation, which the males then fertilize.
Ecological role
As bottom-feeders, they stir up sediment (bioturbation), which can increase water turbidity. In non-native environments, they can become invasive by out-competing local species and altering aquatic vegetation levels.
Similar species
Common Carp (Cyprinus carpio), which lacks the bright metallic colors; Goldfish (Carassius auratus), which lack barbels and typically do not grow as large.
Identification tips
Look for the metallic yellow 'Yamabuki' color and the presence of sensory barbels (whiskers) at the corners of the mouth, which distinguishes them from giant goldfish.
Interesting facts
Koi are symbols of luck, prosperity, and perseverance in many East Asian cultures. Some individual koi have been known to live for over 50 years, and they are capable of being trained to eat from a hand.